Join Date: Feb 2014
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2004 6.0 No heat and overheats
I have read a ton of posts about this but none seem to fit exactly what mine is doing and i am relatively new to the 6.0. At idle the truck has no heat,as soon as you accelerate heater blows hot instantly.I pull a boat that weighs approx 3500lbs.When pulling up an incline it will do fine until about the time the aux fan kicks on.The eng temp is at normal and will spike to hot in a couple of seconds with the overheat light coming on.I let off the gas and pull over and it will go back to normal temp in a few seconds.It only does this when pulling uphill,on flat ground it hauls with no problems.
I have deleted the egr,replaced thermostat,oil cooler,degas cap,flushed system and i have no coolant loss.The truck does have a banks six gun which i turn down to 1 when pulling,it also has exhaust and air intake.
Any ideas or help would be greatly appreciated thanks.